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Method for preparing aluminum fluoride by recycling fluorine-containing waste

A technology of aluminum fluoride and waste, which is applied in the field of cryolite waste recycling, can solve the problems of insufficient utilization of fluorine resources, excessive consumption of high-grade fluorite ore, and excessive export, so as to relieve the pressure of mining and consumption and reduce production cost, effectiveness of addressing hazardous waste

Pending Publication Date: 2021-05-11
淄博华士元环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the insufficient protection of fluorite resources, the development of downstream products and the utilization of fluorine resources in my country, and the excessive exploitation and export of fluorite resources all year round, high-grade fluorite ore is consumed too quickly

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0030] A method for recycling fluorine-containing waste to prepare aluminum fluoride, comprising the following steps:

[0031] (1) First, the fluorine-containing waste is ground with a grinder until the particle size is 100 μm;

[0032] (2) Blend the fluorine-containing waste with 98% concentrated sulfuric acid at a molar ratio of 1:2, supply it to a reactor with a polytetrafluoroethylene jacket, and knead it at 250°C;

[0033] (3) Collect the gas phase generated by the reaction, and freeze the gas to 20°C and increase the pressure to 1100 hPa;

[0034] (4) Distill the collected anhydrous hydrogen fluoride to remove impurities to obtain anhydrous hydrogen fluoride product;

[0035] (5) React the vaporized hydrogen fluoride and aluminum hydroxide at 500°C to produce an aluminum fluoride product.

[0036] (6) washing the unreacted fluorine-containing tail gas with water to prepare low-concentration hydrofluoric acid;

[0037] (7) Rectifying low-concentration hydrofluoric acid...

Embodiment 2

[0039] A method for recycling fluorine-containing waste to prepare aluminum fluoride, comprising the following steps:

[0040] (1) First, the fluorine-containing waste is ground with a grinder until the particle size is 150 μm;

[0041] (2) Blend the fluorine-containing waste with 98% concentrated sulfuric acid at a molar ratio of 1:0.5, supply it to a reactor with a polytetrafluoroethylene jacket, and knead it at 150°C;

[0042] (3) Collect the gas phase generated by the reaction, and freeze the gas to 15°C and increase the pressure to 1100 hPa;

[0043] (4) Distill the collected anhydrous hydrogen fluoride to remove impurities to obtain anhydrous hydrogen fluoride product;

[0044] (5) React the vaporized hydrogen fluoride with aluminum hydroxide at 550°C to produce aluminum fluoride product.

[0045] (6) washing the unreacted fluorine-containing tail gas with water to prepare low-concentration hydrofluoric acid;

[0046] (7) Rectifying low-concentration hydrofluoric acid...

Embodiment 3

[0048] A method for recycling fluorine-containing waste to prepare aluminum fluoride, comprising the following steps:

[0049] (1) First, the fluorine-containing waste is ground with a grinder to a particle size of 200 μm;

[0050] (2) Blend the fluorine-containing waste with 98% concentrated sulfuric acid at a molar ratio of 1:3, supply it to a reactor with a polytetrafluoroethylene jacket, and knead it at 280°C;

[0051] (3) Collect the gas phase generated by the reaction, and freeze the gas to 18°C ​​and increase the pressure to 1150 hPa;

[0052] (4) Distill the collected anhydrous hydrogen fluoride to remove impurities to obtain anhydrous hydrogen fluoride product;

[0053] (5) react gasified hydrogen fluoride and aluminum hydroxide at 600°C to produce aluminum fluoride products.

[0054] (6) washing the unreacted fluorine-containing tail gas with water to prepare low-concentration hydrofluoric acid;

[0055] (7) Rectifying low-concentration hydrofluoric acid to obtain a...

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Abstract

The invention relates to a method for preparing aluminum fluoride by recycling fluorine-containing waste, and belongs to the technical field of cryolite waste reutilization. The method comprises the steps of (1) grinding the fluorine-containing waste by using a grinding machine; (2) blending the ground fluorine-containing waste with concentrated sulfuric acid, and mixing under a high-temperature condition; (3) collecting a gas phase generated by the reaction, and cooling and pressurizing the gas phase to obtain liquid hydrogen fluoride; (4) rectifying the liquid hydrogen fluoride to obtain anhydrous hydrogen fluoride; (5) gasifying and heating the anhydrous hydrogen fluoride prepared in the step (4), and reacting with aluminum hydroxide to generate aluminum fluoride; (6) washing the unreacted fluorine-containing tail gas with water to prepare low-concentration hydrofluoric acid; and (7) rectifying the low-concentration hydrofluoric acid to obtain anhydrous hydrogen fluoride. According to the method, harm of fluorine emission to human health and natural environment is avoided, sustainable recycling of fluorine resources can be promoted, and meanwhile, the method is a green and environment-friendly process with a high additional value.

Description

technical field [0001] The invention relates to a method for preparing aluminum fluoride by recycling fluorine-containing waste, and belongs to the technical field of cryolite waste recycling. Background technique [0002] With the vigorous development of the modern fluorine chemical industry, accompanied by the continuous increase of fluorine-containing waste, more and more companies are facing increasingly severe problems of fluorine-containing waste disposal. The massive discharge of these untreated or substandard fluorine-containing wastes will increase the fluorine content in soil, domestic water for residents and industrial production and domestic water, resulting in environmental damage and endangering people's lives and health. At the same time, this fluorine-containing waste has a very high recycling value. [0003] At the same time, fluorine chemical industry products are also an indispensable part of the modern metallurgical industry, especially the flux in the e...

Claims

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Application Information

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IPC IPC(8): C01F7/50
CPCC01F7/50C01P2006/80C01P2006/82
Inventor 顾晓华张达升陈泓宇刘思雯
Owner 淄博华士元环保科技有限公司
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